Did you ever find a conclusion for this? I’ve got the same issue. The Discovery.php reports the values, but the libreNMS system does not do anything with them.
SNMP[’/usr/bin/snmpbulkwalk’ ‘-v2c’ ‘-c’ ‘COMMUNITY’ ‘-OQUn’ ‘-M’ ‘/opt/librenms/mibs:/opt/librenms/mibs/cisco’ ‘udp:HOSTNAME:161’ ‘.1.3.6.1.4.1.9.9.117.1.4.1.1.1’]
...*.1.1.534 = 2
...*.1.1.535 = 3
...*.1.1.536 = 2
...*.1.1.537 = 2